It may be the season to eat, drink and be merry, but each day of over-indulging can take several hours off your life, according to a Christmas article published on the British Medical Journal website. Activities like smoking, having a couple of drinks, eating red meat and watching television anytime of year can each knock at least 30 minutes off your life expectancy for every day you indulge. In contrast, each day of sticking to just one alcoholic drink, eating plenty of fruit and vegetables, and exercising can be expected to add up to two hours to your life.